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APEX 모델을 이용한 콩 재배 밭 전환 논의 물수지 특성 평가

Water Budget Assessment for Soybean Grown in Paddy Fields Converted to Uplands Using APEX Model

  • Choi, Soon-Kun (Climate Change Assessment Division, National Institute of Agricultural Sciences) ;
  • Jeong, Jaehak (AgriLife Research, Texas A&M University) ;
  • Yeob, So-Jin (Climate Change Assessment Division, National Institute of Agricultural Sciences) ;
  • Kim, Myung-Hyun (Climate Change Assessment Division, National Institute of Agricultural Sciences) ;
  • Kim, Min-Kyeong (Climate Change Assessment Division, National Institute of Agricultural Sciences)
  • 투고 : 2021.02.22
  • 심사 : 2021.06.10
  • 발행 : 2021.07.31

초록

The expansion of upland crop cultivation in rice paddy fields is recommended by the Korean government to solve the problem of falling rice price and reduction of rice farmer's income due to oversupply of rice. However, water use efficiency is significantly influenced by the land use change from paddy field to upland. Therefore, this study aimed to evaluate the water budget of soybean grown in using APEX (Agricultural Policy and Environmental eXtender) model. The amount of runoff was measured in a test bed located in Iksan, Jeollabu-do and used to calibrate and validate the simulated runoff by APEX model. From 2019 to 2020, the water budget of soybean grown in uplands were estimated and compared with the one grown in paddy fields. The calibration result of AP EX model for runoff showed that R2 (Coefficient of determination) and NSE (Nash-Sutcliffe efficiency) were 0.90 and 0.89, respectively. In addition, the validated results of R2 and NSE were 0.81 and 0.62, respectively. The comparative study of each component in water budget showed that the amounts of evapotranspiration and percolation estimated by APEX model were 549.1 mm and 375.8mm, respectively. The direct runoff amount from upland was 390.1 mm, which was less than that from paddy fields. The average amount of irrigation water was 28.7 mm, which was very small compared to the one from paddy fields.

키워드

과제정보

본 연구는 농촌진흥청 국립농업과학원 농업과학기술 연구개발사업(과제번호: PJ013417012020)의 지원으로 수행되었습니다.

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